body {
    padding: 0;
    margin: 0;
}

.navbar {
    display: flex;
    height: 44px;
}

.solt-left, .solt-right {
    width: 70px;
    background-color: red;
    line-height: 44px;
    text-align: center;
}

.solt-center {
    flex: 1;
    background-color: sandybrown;
    line-height: 44px;
    text-align: center;
}
